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- 1. Multiple Choice
A weightlifter lifts two 300 newton weights 1.5 meters off the ground. How much work has she done?
Work = Force x Distance
600 J
450 J
900 J
1200 J
- 2. Multiple ChoiceSimple machines make work easier by increasing what?The distance over which work is doneThe force needed to do workThe time required to do workThe acceleration of a massive object
- 3. Multiple ChoiceThe amount by which a machine multiplies input force is known as thework.power.output force.mechanical advantage.
- 4. Multiple Choice
You do 90 joules of work in 30 seconds. How much power have you generated?
Power = Work/time
30 watts3 watts120 watts270 watts - 5. Multiple Choice
You move a 8 N object five meters in 4 seconds. How much power have you generated?
Work = Force x Distance
Power = Work/Time
160 watts
10 watts
6.4 watts
17 watts
- 6. Multiple Choice
When you rub your hands together on a cold day, you use friction to convert
Mechanical energy into thermal energy
Thermal energy into nuclear energy
Chemical energy into mechanical energy.
Electrical energy into thermal energy
- 7. Multiple Choice
Which energy-conversion chain occurs whenever coal is burned to create steam to spin the generator at a power station?
chemical to mechanical to potential
thermal to chemical to mechanical to electrical
chemical to thermal to mechanical to electrical
chemical to chemical to mechanical to radiant
- 8. Multiple ChoiceLight is an example of _________thermal energyradiant energymechanical energynuclear energy
- 9. Multiple Choice
Which of the following is defined as work done per unit time?
A. energy
B. force
C. power
D. work
- 10. Multiple Choice
50 J of work is done lifting a 20.0 N book in the air. How high was it lifted?
Distance = Work/Force
2.5 m
3.5 m
0.4 m
25 m
- 11. Multiple Choice
What are two things required for work to be done? Check all that apply.
Force
Distance
Power
Constant Speed
- 12. Multiple ChoiceHow much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?15 J45 J0 J5 J
- 13. Multiple Choice
What type of energy do we use to cook food?
A. mechanical
B. radiant
C. thermal
D. kinetic
- 14. Multiple Choice
If 150 Joules of work is needed to move a box 10 meters, what force was used?
Force = Work / Distance
1500 N15 N1.5 N150 N - 15. Multiple Choice
At which point on the roller coaster is the kinetic energy at its maximum?
A
B
C
D
- 16. Multiple Choice
A student with a mass of 62 kg walks up a flight of stairs with a height of 3.4 meters. How can he decrease his power?
walk slower
walk faster
carry his friends books
- 17. Multiple Choice
Check all of the things that can affect power
Work
Time
Force
Distance
- 18. Multiple Choice
A roller coaster whose average speed is 32 m/s is at the top of a 72m hill and weighs 966N. At the top of the hill the coaster car has ___________________ energy.
almost all kinetic energy
almost all potential energy
mostly kinetic energy
some kinetic and some potential energy
- 19. Multiple Choice
Which statement illustrates work done?
A weightlifter holds a barbell above her head.
A teacher applies a continuous force to a book, holding it flat.
A student flicks a paper football and moves it over the edge of a table.
A waiter carries a tray full of meals while listening to a customer.
- 20. Multiple ChoiceEnergy that is stored is called...KineticPotential
- 21. Multiple Choice
The is the energy due to the splitting of atoms.
nuclear
chemical
mechanical
radiant
- 22. Multiple Choice
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
Distance = Work/Force
272 m17 m4.05 m272 cm - 23. Multiple Choice
This is energy that is stored for later use.
kinetic energy
potential energy
mechanical energy
radiant energy
- 24. Multiple Choice
What type of simple machine is a wheelchair access ramp?
Pulley
Inclined plane
Lever
Wedge
Wheel and Axle
- 25. Multiple Choice
Which type of energy converts matter into energy?
Chemical
Nuclear
Electrical
Radiant
- 26. Multiple Choice
Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?
Work = Force x Distance
Power = Work/Time
100 watts
400 watts
104 watts
50 watts
- 27. Multiple Choice
A soccer player kicks a ball with 20 Newtons of force causing it to travel 100 meters. How much work is done on the ball?
Work = Force x Distance
200 J
80 J
5 J
2000 J
- 28. Multiple Choice
A cannon shoots a 1000 N stunt performer 100 m. How much work is done on the performer?
Work = Force x Distance
100,000 J
10,000 J
10 J
1,000,000 J
- 29. Multiple Choice
What type of simple machine is a bike pedal?
Inclined Plane
Pulley
Wheel & Axle
Lever
- 30. Multiple Choice
Which of these simple machines is a lever?
- 31. Multiple Choice
The sun provides ____________ and ____________ energy that can be harnessed and used for solar power.
chemical, sound
mechanical, radiant
sound, radiant
radiant, thermal
- 32. Multiple Choice
This picture shows an example of what type simple machine?
pulley
wedge
lever
wheel and axle
- 33. Multiple ChoiceHow can you decrease the effort force needed to push a weight to the top of the ramp?cover the surface with carpetincrease the length of the rampincrease the height of the rampdecrease the length of the ramp
- Answer choicesTagsAnswer choicesTags